SkagenMen's Aaren Kulor Three-Hand, 41 mm case size, Aluminum Watch with silicone strap

Why does this range of different colour watches vary in price so much ,at least £ 40 difference between colours?

Does this have a luminous dial and hands? I need to be able to see the time in the dark.

Is the inner circumference size of 190 mm the size of just the band or does it also include the length of the case of 41 mm?

Can I wear it swimming?